Total thyroidectomy was not cancer. 3 years later ultra sound now says 6mm hypoechoic nodule may be residual thyroid vs benign appearing lymph node.

First Unusual: total thyroidectomy for non malignant condition , need biopsy report to give accurate answer with outguessing If some with malignant disease , total is done , this nodule needs image guided FNA biopsy ( fine needle aspiration ) Speak to your surgeon.

Thyroidectomy: It's not uncommon in post thyroidectomy patients undergoing sonography of the neck to find hypoechoic (darker) nodule within the neck, since it has many lymph nodes.These can be small and therefore hard to discriminate between nodal tissue vs possible residual thyroid tissue. In either case, both are benign (NOT cancer). Six month follow up sonogram vs. Neck CT vs NM Thyroid Scan reasonable f/u.